LT3570
2
3570fb
ABSOLUTE MAXIMUM RATINGS
V
IN1
, V
IN2
, V
IN3
, V
BIAS
 Voltage ..................................40V
BOOST Voltage .........................................................60V
BOOST Pin Above SW2 .............................................25V
NPN_DRV Voltage .......................................................8V
SW1 Voltage .............................................................40V
SHDN1, SHDN2, SHDN3 Voltage ..............................40V
SYNC, R
T
 Voltage ........................................................3V
SS1, SS2 Voltage ........................................................3V
FB1, FB2, FB3 Voltage ...............................................10V
(Note 1)
V
C1
, V
C2
 Voltage ..........................................................3V
Maximum Junction Temperature...........................125癈
Operating Temperature Range (Note 2)..40癈 to 125癈
Storage Temperature Range
  TSSOP ...............................................65癈 to 150癈
  QFN ....................................................65癈 to 125癈
Lead Temperature (Soldering, 10 sec)
  TSSOP Only ......................................................300癈
24
23
22
21
20
19
7
8
9
TOP VIEW
25
UF PACKAGE
24-LEAD (4mm 4mm) PLASTIC QFN
10
11
12
6
5
4
3
2
1
13
14
15
16
17
18
V
IN2
V
IN2
SW2
SW1
GND
GND
V
C2
SS2
GND
R
T
SYNC
SHDN3
T
JMAX
 = 125癈, ?/DIV>
JA
 = 37癈/W
EXPOSED PAD (PIN 25) IS GND, MUST BE SOLDERED TO PCB
FE PACKAGE
20-LEAD PLASTIC TSSOP
1
2
3
4
5
6
7
8
9
10
TOP VIEW
20
19
18
17
16
15
14
13
12
11
FB1
SHDN1
SHDN2
SHDN3
SYNC
R
T
SS2
V
C2
FB2
FB3
V
C1
SS1
V
IN1
GND
SW1
SW2
V
IN2
BOOST
V
IN3
NPN_DRV
21
T
JMAX
 = 125癈, ?/DIV>
JA
 = 38癈/W
EXPOSED PAD (PIN 21) IS GND, MUST BE SOLDERED TO PCB
 PIN CONFIGURATION
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LT3570EUF#PBF
LT3570EUF#TRPBF    3570
24-Lead (4mm ?4mm) Plastic QFN
40癈 to 125癈
LT3570IUF#PBF
LT3570IUF#TRPBF
3570
24-Lead (4mm ?4mm) Plastic QFN
40癈 to 125癈
LT3570EFE#PBF
LT3570EFE#TRPBF
LT3570FE
20-Lead Plastic TSSOP
40癈 to 125癈
LT3570IFE#PBF
LT3570IFE#TRPBF
LT3570FE
20-Lead Plastic TSSOP
40癈 to 125癈
Consult LTC Marketing for parts speci ed with wider operating temperature ranges. *The temperature grade is identi ed by a label on the shipping container.
Consult LTC Marketing for information on non-standard lead based  nish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel speci cations, go to: http://www.linear.com/tapeandreel/
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